<!DOCTYPE html>
<html>
    <head>
        <style type="text/css"> 
            .shadow{
                width: 100px;
                height: 70px;
                background-color: yellow;
                box-shadow:5px 5px 10px 10px green;
                }
        </style>
    </head>
    <body>
        <div class="shadow"></div> 
    </body>
</html>